1065506261 has 4 divisors (see below), whose sum is σ = 1069353132. Its totient is φ = 1061659392.

The previous prime is 1065506243. The next prime is 1065506287. The reversal of 1065506261 is 1626055601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1626055601 = 9241 ⋅175961.

It can be written as a sum of positive squares in 2 ways, for example, as 88943761 + 976562500 = 9431^2 + 31250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1065506261 - 2¹⁴ = 1065489877 is a prime.

It is a super-2 number, since 2×1065506261² = 2270607184460400242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065506201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1923020 + ... + 1923573.

It is an arithmetic number, because the mean of its divisors is an integer number (267338283).

Almost surely, 2^1065506261 is an apocalyptic number.

It is an amenable number.

1065506261 is a deficient number, since it is larger than the sum of its proper divisors (3846871).

1065506261 is an equidigital number, since it uses as much as digits as its factorization.

1065506261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846870.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1065506261 is about 32642.0933918154. The cubic root of 1065506261 is about 1021.3752629992.

The spelling of 1065506261 in words is "one billion, sixty-five million, five hundred six thousand, two hundred sixty-one".